Reward is used to set the reward a user gets after watching a rewarded video in a specific placement. Different placements can contain different amount of rewards and different types of rewards (in-app currency, bonus points etc.) Setting the type of reward is not required.
The entered parameter goes back to API SDK callback after a successful video impression.
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This is how it looks in Android version of Appodeal SDK:
public void onRewardedVideoFinished(int amount, String name) 

And in iOS:
-(void)rewardedVideoDidFinish:(NSUInteger)rewardAmount name:(NSString *)rewardName